SOLUTION: A chemist needs 180 milliliters of a 39% solution but has only 15% and 69% solutions available. How many milliliters of each should be mixed to obtain the desired solution?

Question 927214: A chemist needs 180 milliliters of a 39% solution but has only 15% and 69% solutions available. How many milliliters of each should be mixed to obtain the desired solution?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = ml of 15%
y = ml of 69%
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15x + 69y = 39*180
x + y = 180
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put the system of linear equations into standard form
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15x + 69y = 7020
x + y = 180
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answer:
x = ml of 15% = 100
y = ml of 69% = 80
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